<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    var socket;
    if (window.WebSocket) {
        socket = new WebSocket("ws://localhost:7000/hello");
        //  收到服务器回送的消息
        socket.onmessage = function (event) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + event.data;
        }


        socket.onopen = function (event) {
            var rt = document.getElementById("responseText");
            rt.value = "连接开启...";
        }

        socket.onclose = function (event) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接关闭...";
        }


    } else {
        alert("当前浏览器不支持websocket")
    }


    // 发送消息
    function send(message) {
        if (!window.WebSocket) {
            return;
        }
        if (socket.readyState = WebSocket.OPEN) {

            socket.send(message)

        } else {
            alert("连接没有开启")
        }

    }


</script>

<form onsubmit="return false">
    <textarea name="message" style="height: 300px;width: 300px"></textarea>

    <input type="button" value="发送消息" onclick="send(this.form.message.value)">

    <textarea id="responseText" style="height: 300px;width: 300px"></textarea>

    <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''">
</form>


</body>
</html>